Taxpayer Advocate Service: Opportunities Exist to Improve Reports to Congress, Report to the Republican Leader, Subcommittee on Oversight, Committee on Ways and Means, House of Representatives [open pdf - 3MB]
From the Highlights: "TAS [Taxpayer Advocate Service], an independent office within IRS [Internal Revenue Service], helps taxpayers resolve problems with IRS and addresses broader, systemic issues that affect groups of taxpayers by recommending administrative and legislative changes to mitigate such problems. Congress mandated that TAS issue two reports every year--one known as the annual report which includes sections on, among other things, the 10 most serious problems encountered by taxpayers, and the other known as the objectives report that discusses organizational objectives. GAO [Government Accountability Office] was asked to review how TAS carries out its mission, focusing on resources and reporting. This report (1) describes TAS's resources and workload, and (2) assesses TAS's reporting to Congress and identifies opportunities for improvement."
Government Accountability Office: http://www.gao.gov/